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There is not really a formula from what I have gotten, but I did get this approximate conversion from a medical source. Unfortunatly it doesn't go very high (my prescription is worse than what this goes up to too.) Hope it gives a little more info though.

20/10 Plano (zero)

20/15 Plano

20/20 Plano to -0.25

20/30 -0.50

20/40 -0.75

20/50 -1.00 to -1.25

20/100 -1.75 to -2.00

20/200 -2.00 to -2.50

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12y ago
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14y ago

A -12.50 D Rx would give you vision of about 20/1500 vision.

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Wiki User

10y ago

Roughly it would be about 20/40.

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Q: What is your vision in terms of 20-20 vision if you have a -12.5 eye prescription?
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